Pictures: Growl-A-Ween Parade

Pet owners take their dogs dressed in Halloween costumes for a walk in the Growl-a ween Parade through Old Town in Pasadena, California on October 26, 2014, a few days before Hallloween.

Pet owners take their dogs dressed in Halloween costumes for a walk in the Growl-a ween Parade through Old Town in Pasadena, California on October 26, 2014, a few days before Hallloween. (FREDERIC J. BROWN / AFP / Getty Images)

Kibbles, dressed as a 'Punk Rocker' and 'Unicorn' dog Parker (right) react to the growls from a Chihuahua as pet owners take their dogs dressed in Halloween costumes for a walk in the Growl-a ween Parade through Old Town in Pasadena, California on October 26, 2014.

Kibbles, dressed as a 'Punk Rocker' and 'Unicorn' dog Parker (right) react to the growls from a Chihuahua as pet owners take their dogs dressed in Halloween costumes for a walk in the Growl-a ween Parade through Old Town in Pasadena, California on October 26, 2014. (FREDERIC J. BROWN / AFP / Getty Images)